I know that STEAM has for some reason or another blocked ArmA 2 Free and ArmA 2 demo, so heres a small cheat. Just for you. :D

If you at any time had ArmA 2 Free downloaded via STEAM, but have deleted it, you can reclaim it! Mearly go into your 'Wishlist', then navigate the tabs to 'All Games'. It should show up there, so all you need to do is scroll and find it, then clikc that little download button to the right!

Yup! Wishlist is a bust, because they removed it completly. >:( Darn you STEAM! Welp. Aslong as you know Prone's way. Friend me! I spend a good amount of time of ArmA 2 Free, so you could get that! :D Also, I got a smaaalll~ group going, 'Robot Productions Gaming Community'. I've made it for my friends, but if you all want to, It can be reused as a troublefix and little cheat finder! :D